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Bacharach B-Smart sensor for Fyrite Pro combustion analyzer

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I'm about to replace the sensors (CO and O2) on my Bacharach Fyrite Pro. For CO, you can pay more and get a B-Smart CO sensor that is already calibrated. Worth it?
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab